Electric lighting



Dem 1948. A. L. ARENBERG ELECTRIC LIGHTING 2 Sheets-Sheet 1 Filed Nov. 8, 1946 CZZberZ Z INVENTOR. Z'rerzbe g g a/ww Dec. 14, 1948. A. L. ARENBERG 2,456 166 ELECTRIC LIGHTING Filed Nov. 8, 1946 2 Sheets-Sheet 2 75 619 INVENTOR.

674661 3 Z. @erzbe/g i aiented Dec. 14, 1948 ELECTRIC LIGHTING Albert L. Arcnberg, Highland Park, Ill., assignor to Patent License Corporation, Chicago, Ill., a corporition of Illinois Application November a, 1946, Serial No. 708,557

1 Claims. (Cl. 176-34) My invention relates to electric lighting and is more particularly concerned .with electric light bulbs intended to be-mounted in or on the. celling for producing controlled. lighting in predetermined restricted areasbelow the ceiling.

It is an object of my invention .to provide a light bulb comprising a base, a light producing filament and an evacuated housing which is so constructed, that, when the bulb is secured in a socket in the ceiling and lighted, it will produce a light, on a predetermined planeandwithin a predetermined area beneath theceiling, which is of suilicient intensity. for reading, and also, a band of diffused light directed radially of the bulb along the ceiling.

It is a more specific object of my invention to provide a light bulb which has incorporated therein a reflector for directing the light rays in a predetermined direction, aims for controlling certain of the rays to produce a light of reading intensity, on a plane and within a predetermined area beneath the bulb, and an annular rin portion between the periphery of the reflector and the lens for directing a band of diflused light radially oi the bulb.

These and other objects will be apparent from a description of the preferred embodiment and the modifications of my invention which are shown, by way of illustration, in the accompanying drawings, wherein:

Fig. 1 is a view illustrating a cross section of a railway car having mounted in the ceiling thereof a light bulb embodying the principles of my invention;

' Fig. 2 is a cross-sectional view of the light bulb shown in Fig. 1;

Fig. 3 is a cross-sectional view similar to Fig. 2 showing a modified form of light bulb; and

Fig. 4 is a cross-sectional view similar to Fig. 2 showing a further modified form of light bulb.

The preferred form of my light bulb, as illustrated in Fig. 1, may be installed in the ceilin Ill of a railway car ll, directly above a pair of seats l2 which are adjacent a window I! in theside wall i4 oi the car ii. The particular type of railway car illustrated has a rounded top It above the ceiling l and is provided with advertising cardspace II in the curved section between the ceiling l0 and side wall i4. The lightbulb I1.

the advertising cards in, the space I! are sup-.

plied witha amused lightoi less intensity" but 2 which is sufllcient for the passengers to read the same.

As shown in Fig. 2 the bulb I1 is supported in a recess which is formed by the member II in the ceiling ill, the bulb I! being provided witha conventional base l9 which is detachably secured in a cooperating socket 2|! supported by the re cess forming member ii. The member I! is secured in the ceiling ill in any conventional manner or formed integrally therewith. The base it supports a light producing filament 2| of conventional design. Attached to the base I! and enclosing filament M is an evacuated housing 22 which consists of three parts or sections-a reilector section 23, an annular ring or band section 24 and a lens section 25. The reflector 22, the band 24 and the lens 26 are preferably formed integral. The reflector 22, which is connected to the base i9, is a generally concave convex member and is provided with a reflecting medium, such as silvering, on the interior concave surface 26 which functions as a reflecting surface for directing the rays of light emanating from the filament 2i away from the base I! in a generally downward direction relative to the ceiling ID, as illustrated in Fig. 2.

The reflector section 22 terminates in the tubular or annular rin section 24 which is of sumcient depth to provide a band of laterally directed light generally transverse to the longitudinal or vertical axis (as shown in Fig. 2) of the bulb II.

The ring 24 is preferably provided with a surface or coating 21 which will result in the passage of diffused light. This'surface 21 may be etched. corrugated, or coated with a diifusing enamel, of the desired density. The light transmitted by the ring 24 is directed along the ceiling l0 around the bulb I! and the advertising space I on the side i 4 of the ,car II. The intensity of this band of light is predetermined by the particular surface or coating provided on the surface 21 of the ring 24.

The lens 25 which is joined at its periphery to the ring 24 has a generally convex outer surface 28 provided with a central clear section 29 and prism formations 30 for controlling or concentrating both the direct and reflected rays of the bulb within a predetermined area directly beneath the lens 25 so as to provide light of adequate intensity for comfortable reading by both passengers sitting in the seats I 2.

As illustrated in Fig. '1, the bulb l1 provides proper reading light for the passengers sitting in the'seats i2 and suillcient light for the ceiling l0 and the advertising card area 16. At the same 8 time it prevents glaring light from falling in the aisle area it between the seats.

A modified form of my invention is illustrated m m. s. The bulb u is supported in a recess which is formed by a member ll in the ceiling II, the bulb ll being provided with a conventional base 48 which is detachably secured in a cooperating socket 4| supported by the recess forming member I. The base 43 supports a filament 4B which is enclosed in an evacuated housing 40. The housing It includes a dome-like reflector section 41 which isconnected at its top edge to the base ll and terminates at its lower edge in a tubular section or ring II. The reflector section 41 is reversely curved, as illustrated, and is provided with a silver coating. or the like, to P oduce an inside surface 49 which functions as a reflector for the light rays emanating from the filament ll and directs the same in a generally downward direction relative to the ceiling 42. The ring II is provided with a surface II which is etched, enameled or corrugated to transmit a band of diifused light in a direction transversely of the longitudinal or vertical axis of the bulb. The lower edgeof the ring 40 is joined to the periphery of a lens II. The lens Ii is concaveconvex in section and may be lightly hazed, if desired.

s licates In this form. of my invention the bulb 00 is positioned in the recessas illustrated, and light of sufficient intensity for reading is directed downwardly by the lens it while a band of diflused light is directed along the ceiling I! by ing member ii in the ceiling if, a socket I being.

supported in the recess for receiving the base Id of the bulb II. The base It supports a fllamentt5 and an evacuated housing II which encloses the filament I. The housing I consists of a dome-shaped reflector portion 81 which is provided with silvering, or the like, on a generally concave inside surface II which functions as, a reflector for light rays emanating from the mament CI. The reflector portion 01 is Joined at its lower edge with the periphery of a lens portion es which is concave convex in section. The lens portion 00 includes a peripheral ring or band section II at its outer edge. The ring section I0 is provided with diifusing enamel, etching or corrugations on the surface H to permit the passage of a diflused band of light in a generally horizontal direction radially of the bulb. The central section 12 of the lens portion ll is clear to permit passage of the light rays in a downward direction beneath the bulb t0.

In this form of my invention the bulb II is positioned, as illustrated, with the ring section ll immediately below the ceiling l2 and light for reading is directed downwardly by the lens section 12 while the annular ring ll directs a band of diffused light on the ceiling l2.

I have illustrated and described my light bulb as installed in the ceiling of a railway car, but it may be used in any other desired place, such as over car steps, on car platforms, in passageways, in washrooms, in baggage racks, for bus lighting, in airplanes, or in any other place desired.

I have referred to speciflc materials and details of construction for the purpose of illustration only and it will be understood that other materials and other details may be resorted to within the scope of my invention.

I claim:

1. An electric light bulb having a base and a housing extending from said base comprising a dome-shaped reflector portio'n, a lens portion, and an annular diflusing. band portion spacing said lens portion from said reflector portion.

2. An electric light bulb comprising-a housing having a conically shaped upper portion, an.intermediate band portion, and a concave-convex shaped lower portion, said upper portion being provided with ,a light reflecting medium and said intermediate band portion being provided with a light diffusing medium.

3. An electric light bulb comprising a housing having opposed generally concave portions, and an intermediate annular band portion, one of said concave portions being provided with a reflecting medium and the other of said conical portions being provided with a means to control the transmission of the light rays within a predetermined area upon a predetermined reading plane beneath the bulb.

4. An electric light bulb comprising a housing having a dome-shaped reflecting portion, an opposed light transmitting lens portion, and an intermediate annual ring portion connecting said reflector portion and said lens portion, said intermediate ring portion being provided with diffusing enamel of predetermined thickness.

5. An electric bulb comprising a base, a light producing filament supported in said base, a dome-shaped bulb section secured to said base around said filament and providing therefor a generally concave reflecting surface for directing the rays produced by said filament away from said base, and bulb sections for controlling said rays to provide a predetermined area with high intensity light in a direction away from said base and to provide a band of diflused light laterally of said base.

6. An electric bulb comprising a base, a light producing filament, and two generally concave bulb sections in opposed relation enclosing said filament, one of said concave sections being attached to said base and providing a reflecting surface for directing rays of light produced by said filament toward said other bulb section and said other bulb section having a circumferential portion adjacent the connecting edges of said sections for providing a laterally directed band of diffused light.

7. An electric bulb comprising a base,'a domeshaped generally concave reflector member secured to said base, a filament supported by said base'and extending into said reflector member whereby light rays produced by said filament will be directed away from said base, a light transmitting lens opposite said reflector for concentrating said light rays on a predetermined restricted area, and a peripheral diffusing band connecting said reflector and said lens for providing a band of laterally directed diffused light.

ALBERT L. ARENBERG.

REFERENCES CITED The following references are of record in the flle of this patent:

UNITED STATES PATENTS 

